Lennox G61MP Furnaces | FurnaceCompare®

Lennox G61MP Furnace Overview

The G61MP is a high-efficiency gas furnace from Lennox. With more than ten models available, heating capacities in this series range from 44,000 to 132,000 BTU/H and models can reach up to 95 percent AFUE. Units can be installed in upflow, downflow, horizontal right and left positions.

Featuring two-stage heating, the manufacturer explains that the G61MP can help increase efficiency by operating on a lower heat setting until a change in the temperature is detected. At that time, the unit will automatically transition to a high heat setting.

Additional features of this series include: an aluminized stainless steel heat exchanger, continuous low-speed fan, insulated blower compartment to decrease operating noise, and a diagnostic control board. All units are equipped for use with natural gas, but kits are available for conversion to LPG operation.

Furnace Filters for the Lennox G61MP

Air Flow ConfigurationCabinet WidthFilters
All 17-1/2″ 16x25x1 (side)
16x25x1 (bottom)
All 21″ 16x25x1 (side)
20x25x1 (bottom)
All 24-1/2″ 16x25x1 (side)
24x25x1 (bottom)

Questions about this model?

Consumer Reviews of Lennox G61MP


  • Very Satisfied
  • Somewhat Satisfied
  • Neutral
  • Somewhat Unsatisfied
  • Very Unsatisfied
  • #9 of 29 Lennox Furnace
  • 37.5% of customers recommended

Read Reviews of Other Lennox Products

Find ratings and reviews for Lennox Air Conditioners, Boilers and more

Read Reviews

Top 10 Furnaces

See who made our list of the best Furnaces of 2022.

See the Top Products

Find a Certified Heating & Cooling Professional In Your Area

Contact a top-rated local expert to help with all of your home's HVAC needs.

Lennox G61MP Furnace Reviews

Showing 6-8 of 8 reviews

"Two-stage blower motor unbearably noisy"

1.0 rating
Very Unsatisfied

Thank goodness our installer, R.G. Wahl in Saline Mich replaced this furnace under warranty. Ironically, the two-stage blower motor is supposed to be quieter than the single stage in the g51 model, but that just was not true for us. The blower motor kept our household up at night. It would whine like a jet plane taking off, then after awhile whine back down to a lower level, then it would either turn off (thankfully), or whine back up. We never knew what it was going to do next… whine up, or turn off, and it just kept us on edge when we were trying to sleep. We are so thankful that our installer replaced it with a different model under warranty, at no charge. Whew!!!!

Saline, MI

"Well made UNIT"

5.0 rating
Very Satisfied

Okay so I bought this unit from my boss. I am a qualified gas fitter and I do work on Lennox products. Before I worked on them I was working on American Standard/Trane(Same furnace just different badge). Lennox is well made American product. The thing with gas fired appliances they still need to be maintained. Myself being a gas fitter that works on these unit would recommend this furnace if you are looking to maintain it.

Espanola Ont

"White-rodgers board"

1.0 rating
Very Unsatisfied

I have Lennox G61mp furnace which I bought on-line. I Am a pipefitter\hvac tech employed in the auto industry.Of course I installed the furnace myself!! The white-rodgers board went bad.I Called Lennox about the 10yr. parts warranty and was informed unless the furnace was installed and serviced by Lennox I do not have a warranty at all.I Bought 2 boards on amazon.com $170.00 each. Lennox wanted $500.00 cash for the 15 min easy fix. Beware of Lennox unless you work for them. I Only hope I can last the winter.


Other G61MP Reviews

Although there are quite a few troubleshooting inquiries posted around the web, consumers and contractors generally like the Lennox G61MP. Homeowners on hvac-talk.com are happy with this unit, noting its quiet and efficient operation. Contractors also recommend this unit to shoppers, saying that if it’s installed correctly it should give years of quality performance.

Among the positive reviews, forums including justanswer.com host a handful of troubleshooting inquiries for this unit. Problems such as the igniter not working, faulty control boards, the unit failing to fully heat, and component failures are among the issues reported.

Question and Answer


What does a 4+3 code on my G61MP mean?


A 4+3 code on the Lennox G61MP is a Watchguard code which means “Exceeded maximum number of retries or last retry was due to flame failure”.

Lennox G61MP Model Numbers

The G61MP is available in different models which vary in efficiency and capacity.

Model Number AFUE BTUs per Hour
G61MP-36B-045-* 94.1 44,000
G61MP-36B-045-** 94.1 44,000
G61MP-36B-070-* 94.1 66,000
G61MP-36B-070-** 94.1 66,000
G61MP-36B-071-* 95 66,000
G61MP-48C-090-* 94.1 88,000
G61MP-48C-090-** 94.1 88,000
G61MP-48C-110-* 94.1 110,000
G61MP-48C-110-** 94.1 110,000
G61MP-60C-090-* 94.1 88,000
G61MP-60C-090-** 94.1 88,000
G61MP-60C-091-* 95 88,000
G61MP-60C-091-** 95 88,000
G61MP-60C-110-* 94.1 110,000
G61MP-60C-110-** 94.1 110,000
G61MP-60C-111-* 95 110,000
G61MP-60C111-** 95 110,000
G61MP-60D-135-* 94.1 132,000
G61MP-60D-135-** 94.1 132,000

G61MP Warranty

The G61MP is equipped with a 5-year limited warranty on all covered components. In addition, Lennox offers a lifetime limited warranty on the heat exchanger. Homeowners should contact a local dealer for registration information specific to their unit.

HVAC Brands

Learn more about your home's heating and cooling system with our guides, how-to's, FAQ's, tips and more.

Ready to get a quote from an HVAC contractor?

Let us know what type of service you need and we can connect you with a certified local HVAC contractor.

Please enter a valid name

Please enter a valid phone number

Please enter a valid zip code

There are no dealers in this zip code.

Please enter a valid email address

Please select repair or replace

Please select heating, cooling or both